Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Thursday, 21 January 2021

‹ 18.01.2021 2021 22.01.2021 ›

Photosphere sunspot drawing and RDS evaluation

21.01.2021 photosphere drawing

High-resolution scan (3231 px)

Time
07:30 UT
Observer
Süleyman FİŞEK
g
2
f
11
R
31
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · DSO – 2Group 1 · DSO – 2 Group 2 · DAI – 9Group 2 · DAI – 9
RDS data file (.gzd) 
[Gözlem]
Tarih=21.01.2021
Saat=07:30
Gözlemci=Süleyman FİŞEK
KontrolEden=Başar COŞKUNOĞLU
Durumaçısı=-7.65
Enlemaçısı=-5.16
Boylamaçısı=12.65
Boylamfark=2
GKalite=3
GDurum=K.T
Kuzeyaçısı=-0.4
Sırano=19115
AyRasatNo=10
RasatÖnceki=18.01.2021
RasatSonraki=22.01.2021

[Leke Grupları]
Grupsayısı=2:0:2
LekeSayısı=11:0:11
RölatifSayı=31:0:31
01=DSO 02 -17.638 -33.678 338.972 +0.000 0000 0 -16.465 -32.862 -18.811 -34.493 +00.000 +00.000 +00.000 +00.000
02=DAI 09 -16.820 -44.516 328.134 16.606 0000 0 -15.584 -41.170 -18.550 -47.862 -17.621 -42.128 -16.894 -44.564
20210121.gzd

Chromosphere (H-α) FITS frames

H-α

The images are made automatically with a fixed, gentle rule: uneven illumination and most of the limb darkening are removed, and the brightness is shown on a linear scale (no sharpening); prominences get their own scale outside the limb. Frames are ordered by sharpness (seeing); frames without the Sun (darks, bias) come last. Method →

2021/20210121_sf · SF · 3 frames · 64.3 MB · 07:48:59–07:51:54 UT

07:50:50 UT · 40 ms 07:48:59 UT · 70 ms 07:51:54 UT · 70 ms

Coronado H-α animations from frame sequences

No Coronado observation for this day.